172 



TREES OF NORTH AMERICA 



stalked, nearly ' in length, or in one form globose-conical and short-stalked (var. 

 congesta, Bebb). 



A tree, 40 -50 high, with a straight trunk nearly 2 in diameter, slender spread- 

 ing branches, and slender light or dark orange-colored or bright red-brown branch- 

 lets coated at first with hoary deciduous pubescence; often much smaller, with an 

 average height of 20-30. Winter-buds ovate, somewhat obtuse, pale chestnut- 

 brown, \'-\' long. Bark '-!' thick, dark brown slightly tinged with red and deeply 

 divided into irregular connected flat ridges broken on the surface into thick closely 

 appressed scales. "Wood light, soft, light brown tinged with red, with thick nearly 

 white sapwood. 



Distribution. Banks of streams; western California from the Oregon boundary 

 to the southern borders of the state, ascending to elevations of 3000 on the western 

 slopes of the Sierra Nevada. 



5. Salix Bonplandiana, H. B. K. "Willow. 



Leaves involute in the bud, 4'-6" long, '-f ' wide, linear-lanceolate to oblong- 

 lanceolate, gradually narrowed and often unequal at the wedge-shaped base, acumi- 

 nate, with long slender points, obscurely serrate, with- glandular teeth, or entire, 

 with revolute margins, thick and firm, reticulate-veiujlose,yellow-green and lustrous 

 above, silvery white below, with broad yellow midribs, falling irregularly during 

 the winter; their petioles stout, grooved, reddish; stipules ovate, rounded, slightly 

 undulate, thin and scarious, ^ f -\' iMtoad, often persistent during the summer. 

 Flowers: aments on leafy branches, cylindrical, erect, slender, short-stalked, the 

 staminate l'-l' long and somewhat longer than the pistillate; their scales broadly 

 obovate, rounded at the apex, light yellow, villose on the outer face and glabrous 

 or slightly hairy above the middle on the inner face ; stamens usually 3, with free 

 filaments slightly hairy at the base; ovary slender, oblong-conical, short-stalked, 

 glabrous, with nearly sessile much-thickened club-shaped stigmas, surrounded below 

 by a large irregular cup-shaped glandular disk. Fruit ovate-conical, rounded at 

 the base, light reddish yellow. 



A tree, rarely more than 30 high, with a trunk 12'-15' in diameter, slender 

 erect and spreading branches often pendulous at the ends, forming a broad round- 

 topped head, and slender glabrous branchlets marked with occasional pale lenticels, 



